Core drill



July 26! T. L. DEE

CORE DRILL Filed April 30. 1924 anism having grea was y 26 1921.

UNITED STATES mile m PATENT OFFICE;-

or emcaeo, m nors, assrqrion ro sULLrvaN n epilrm A cost m s 9 es av n Application n a April so, 1924 we; so. 710417.

My. invention relates to core drills. A 7 An object of my inyention is to rovide an improved core lifter for such a rill. Anotherobject of invention to provide an improved core. ifter mechanism of great elasticity and strength especially adapted to act upon cores of asoft character. A rther and morespecific object of my invention is to provide an im roved core lifter mechlarge internal diameter permittin a g has a 'assage of a core therethrough w le read still I in position within the core barrel when the latter is raised from the hole. These and other ob'ects and advantages of my improved mec anism will hereinafter more fullya pear.

In t e accompanying drawings I have shown for purposes of illustration one form which my invention may assume in practice.

Inthese drawings,--

Fig. 1 is a w view of a core'barrel and drill bit which embody my improved core lifter mechamsm, the section through the lifter being taken on line 1-1 of Fig. 2.

, Fig. 2 is a plan view, partially brolien away to facilitate illustration, of my 1mproved corelifter.

Fig. 3 is a side elevation of Fig. 2.

, In this illustrative construction I have shown, for purposes ofillustration, a core barrel l'threaded as at 2 to a core liftercas ing or shell 3, the lower end of 'whichis threadedly connected as-at 4 to; a core drill bit 5 of a usual form, herein of the rotary diamond t e, while the core lifter casing is provide with an internal conical bore 6 with the inclined surfaces 7 of which-a core lifter, generally designated 8, of improved form to be herein more fully described, is adapted to engage.

In my improved construction the core lifter 8 comprises a plurality of radially spaced wedges 9 of identic construction having outwardly inclined surfaces 10 formed at the inner ower edges thereof which are adapted'todirect the core upwardly through the core lifter. Carried by the inner periphei'y of these wedges is a radially expandin}; annular sheet metal sprin member 11 adapted to grip a core and aving great elasticity, the member 11 being rigidly seresiliency and .one which mg} adapted tohold the same firmly central longitudinal sectional cured thereto as by rivets 13, the heads of which are peened or headed ewer'in'bunwrbores 14 formed in the"spring" and the outer peripheries of the wedges in such man ner as to form a wee Team act and rigid construction. The lower en of the spring member 11 is herein also spot weldedto the wedges as at 15 forinin a smooth joint As shown, the spring memier Hand one Of the wedges 9 are split as at 16 in such manner as to permit the ready ei ipansionand contraction of the core lifter.

While I have in this a plication specificallydescribed one form c'h my invention may assume in practice, it will be understood that this form of the same is shown for purposes of illustration and that the invention may be modified and embodied in other forms without departin from its spirit or the scope of the ap ende claims.

What I claim as new an desire to secure by Letters Patent is: i l. A core lifter comprising separate spaced wedge shaped supportiii members, anannular core gripping mein er,and means for rigidly securin said core grippmg member tip the inner sur aces of said's'uppertin'g memers. 2. A core lifter comprising separate spaced wedge shaped supporting"members, an annular core gripping spring, and means for rigidly connecting said spring to theinner surfaces of said supporting members.

3. A core lifter comprisingseparate radially spaced wedge shaped supporting members, a radially expansible core ipping spring member, and means for rigid y securing said spring member to the inner surfaces of said supporting members. A

4. A core lifter comprising separate spaced wedge shaped supporting members each having a vertically disposed innersurface, a core gripping spring member, and means for rigidly securing said spring member'to the inner surfaces of said supporting members.

5. A core lifter comprising separate spaced wedge shaped sup orting members, a split annular spring, an means for rigidly securing each of said supporting members to the outer surface of said spring.

6. A core lifter comprising separate spaced wedge shaped supporting members each having a projecting shoulder formed-thereon, an annular split spr ng, the shoulders on said supporting members underlying the lower edge of said spring, and means for securing each of said members to the outer surface of said spring. 1

7. A core lifter comprising separate spaced wedge shaped supporting members each having an inwardly projecting shoulder formed thereon, an annular core gripping split spring, the shoulders on said supporting members underlying the lower edge of said spring, and means or securing each of said members to the outer surface of said spring. 8. A core lifter comprising separate spaced wedge shaped supporting members each ,having a reduced inner surface and an inwardly projecting shoulder, a split annular spring member engaging said shoulders, and means for rigidly securing each member to said spring member. a

9. A core lifter comprising separate spaced wedge shaped supportin members each having a reduced inner sur ace andan inwardly projectin shoulder, a split annular spring member isposed agi'acent said surfaces and engaging said sho ders, the latter underlying the spring, and means for rigidly securing each member to said spring member. 10. A core lifter comprising se arate spaced wedge shaped supporting mem ers, a split resilient core gripping element, and means for rigidly securing each wed e member to the outer surface of said resilient element.

11. A core lifter comprising separate spaced wedge shaped supporting elements each having an inwardl inclined core guiding surface and an inclined outer surface, a split resilient core gripping element, and means for rigidly securing each of said wedge elements to the outer surface of said resilient element.

12. A core lifter comprising separate spaced wedge shaped supporting members each having an inclined external surface, a resilient core gripping member, and means for rigidly securing said core gripping member to the inner surfaces of said supporting members.

13. A- core lifter comprising separate spaced wedge shaped supportin members each-having an inclined externa surface, a radially expansible annular split core gripping spring, and means for rigidly securing said spring to the inner surfaces of said supporting members.

14. A core lifter comprising separate spaced wedge shaped supporting members each having. an inclined external surface and a vertically disposed inner surface, a resilient split core gripping member, and means for rigidly securing said core gripping member to the .inner surfaces of sald supporting members.

In testimony whereof I afiix my signature.

THOMAS L. DEE. 

